True of AppleScript, but not of omniJS JavaScript, as it happens.
It could be done with a custom omniJS plugin which would run on both macOS and iOS.
See, for example:
and Automation > API Reference
But for JS plugins you might have to upgrade to the full edition.
It might be worth looking at:
Omni-Automation/Total of estimated minutes.omnifocusjs at master · unlocked2412/Omni-Automation
